Production and stability testing of incurred reference materials for the anabolic steroid trenbolone in bovine urineS Sterk, F Tricht, B Le, L Ginkel, R Stephany28/01/1999Journal Article
Postoperatieve wondinfecties. Validatie van de landelijke surveillanceR Haas, AS Boer, ELPE Geubbels, JMJ Berg, AJ Mintjes, A Voss04/01/1999Journal Article
Overestimation of the prevalence of hypertension in the populationOH Klungel, JC Seidell, A Boer28/01/1999Journal Article
Nortestosterone: endogenous in urine of goats, sheep and maresS Sterk, H Herbold, M Blokland, H Rossum, L Ginkel, R Stephany28/01/1999Journal Article
Nitrogen, the Confer-N-s. First international nitrogen conference 1998, March 1998, Noordwijkerhout, the NetherlandsKW Hoek, JW Erisman, S Smeulders, JR Wisniewski, J Wisniewski, eds25/01/1999Journal Article
Nitrogen monitoring in groundwater in the sandy regions of the NetherlandsD Fraters, LJM Boumans, G Drecht, T Haan, WD Hoop25/01/1999Journal Article
Nitrate leaching in dairy farming: economic effects of environmental restrictionsR Groeneveld, AF Bouwman, S Kruitwagen, EC Ierland25/01/1999Journal Article
Multi-laboratory study of the analysis and kinetics of stanozolol and its metabolites in treated calvesHF Brabander, K Wasch, LA Ginkel, SS Sterk, MH Blokland, et al.28/01/1999Journal Article
Mixed farming systems as a way towards a more efficient use of nitrogen in European Union agricultureGJM Oomen, EA Lantinga, EA Goewie, KW Hoek25/01/1999Journal Article
Meer informatie over infectieziekten door landelijk systeemMJW Sprenger, PM Schrijnemakers04/01/1999Journal Article